package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

//根据id删除分类，删除之前需要进行判断
@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;

    //根据id删除分类,删除前需要判断
    @Override
    public void remove(Long categoryid) {
        //添加查询条件,根据分类id进行查询菜品数据
        LambdaQueryWrapper<Dish>dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishLambdaQueryWrapper.eq(Dish::getCategoryId,categoryid);
        int count = dishService.count(dishLambdaQueryWrapper);
        //如果已经关联,抛出一个业务异常
        if(count > 0){
            throw new CustomException("当前分类下已经关联了菜品,不能删除");
        }

        //查询当前分类是否关联了套餐,如果已经关联,抛出一个业务异常
        LambdaQueryWrapper<Setmeal>setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,categoryid);
        int count2 = setmealService.count(setmealLambdaQueryWrapper);
        if(count2 > 0){
            throw new CustomException("当前分类下关联了套餐,不能删除");//已经关联套餐,抛出一个业务异常
        }
        //正常删除分类
        super.removeById(categoryid);//super 子类继承父类方法
    }
}
